connect: skip service registration only for duplicate services on k8s #581
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Previously, we would skip service registration if we find a duplicate service
even when the 'k8s-namespace' meta key is not present on the service.
However, that is not correct behavior since that would ignore any service
instance that could exist on other platforms (e.g. VMs) and that
doesn't have this meta key. We should instead only check services that
have the 'k8s-namespace' meta key.
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